Twisting-machine



(No Model.)

G. H. SELLERS.

TWISTING MACHINE. No. 497,827. Patented May 23, 1893.

[I Q MNIILMMWL I mimessag u 1 5 UNiTED STATES PATENT OFFICE- GEORGE II.SELLERS, OF WILMINGTON, DELAWARE.

TWlSTlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 497,827, dated May 23,1893,

Application filed May '7, 1892- Serial No. 432,137. (No model.)

To all whom it may concern:

Be it known that 1, GEORGE H. SELLERS, of 1301 Rodney street, in thecity of Wilmington, county of New Castle, State of Delaware, haveinvented a certain new and useful Improved Twisting-Machine, of whichthe following is a true and exact description, reference being had tothe accompanying drawings, which form a part of this specification.

My invention relates to mechanism intended for twisting flanged bars,and is especially intended and adapted for use in the manufacture ofdrills, &c., such as are used and described in the patent granted to meDecember 23, 1890, No. 443,297; the object of myinvention being toprovide simple and easily operated mechanism by which straight flangedbars can be twisted with rapidity and precision to the required spiralform.

The nature of my invention will be best understood as described inconnection with the drawings in which it is illustrated, and in which-Figure 1 is a side elevation showing the operative parts of the machineconstructed in accordance with and embodying my improvement. Fig. 2 is across-section on the line 1-2 of Fig. 1. Fig. 3 is a cross-section 0nthe line 34 of Fig. 1: Fig. 4 an end elevation of the die holder andconnected part-s; Fig. 5 a perspective View of two of the sectionaldies. Fig. 6 is a perspective view of one of the sectional dies with twosections removed and showing the internal construction. Fig. 7 is aperspective view of the flanged bar; Fig. 8 a perspective View of theflanged bar after it is twisted, and Fig. 9 is a View of a drill madefrom the twisted bar.

A A are grooved rolls used in forming and feeding the flanged bar H.

B and B are two parts of a guide situated in front of the grooved rollsand adapted to receive the flanged bar as it passes from be tween therolls and carry it to the twisting dies. The cavity ]3 in the guides issuch as will receive and support the bar, preventing it from bucklingunder the pressure applied to it.

C is a die holder supported as shown upon the rest bar D arranged inline with the rolls and supporting the guides B B as shown. Theconstruction of the holder must be such that it will support thesectional dies used in twisting against the strains to which they areexposed; and, at the same time, permit of their ready insertion andremoval. As shown,the holder is provided with a cylindrical cavity, atthe top of which is formed a key seat 0, and it is also adapted toreceive at its delivery end a stop or gate G, the function of which willbe hereinafter described.

E is a sectional twisting die which is made up of a number of sectionsequal to the number of flanges in the bar to be twisted, and each ofwhich is adapted to lie between adjacent flanges of the bar,and is givena curvature such as it is desired to impart to the bar; thus, eachsectional part of the die has itself a spiral form, and I prefer to makethe length of the die, and of each section of it, equal to one-fourth ofthe length taken up by a single turn imparted to the bar. Thus, forinstance, where the bar is twisted seats to make one complete turn innine inches, the length of a die E would be two and one-fourth inches. Asingle sectional die of this proportion may be used alone or it may besupplemented by additional sectional dies as indicated at E, E and EW'hen four are used, as shown in Fig. 1, the bar is completely withinthe die for a distance of that equal to one twist. As shown in thedrawings, the exterior form of the die is cylindrical; the diameterbeingsuch as will enable it to be inserted in the cylindrical cavity of theholder, and as shown, a groove or key-seat E is formed along theperiphery of the dies, so that when the dies are inserted in the holderand arranged in proper alignment they can be locked against rotarymovement by the inserting of a key F engaging the groove in the dies andthe groove in the holder. In order to hold the dies against longitudinalmovement in the holder, a stop or gate, as indicated at G, can be thrustdown through a proper passage in the holder, which, will rest againstthe outermost die, preventing the dies from being pushed out whileforming the bar, and issue partly through the spiral cavity E formed bythe abutting sections.

I have indicated the flanged bar by the letter H; the flanges by theletters h h, etc.

The spirally twisted bar is indicated at H, and at H Fig. 9,1 have shownthe end of the 7 thus, necessarily twisting it to the desired form.After leaving the die E the spirally twisted bar will continue throughthe dies E E 850., finally issuing from the end of the die system, andthe holder, as soon as the bar has passed from the bite of the rolls,its forward motion will stop, and then by releasing the holding devicewhich holds the die sections in place, as shown, the key F and gate G,the dies together with the twisted bar can be readily removed from theholder, and in the same way another set of dies at once introduced intothe holder to act upon another bar.

It will be obvious that by making my die E sectional and removable fromtheir holder, I provide a ready and simple device for withdrawing thetwisted bar from them, while with a solid die the bar would have to betwisted out of the die, and it will also be seen that by my sectionalconstruction I avoid the danger due to dies bursting under the pressureto which they are subjected which exists with solid dies.

I may mention that while I show a four flanged bar I do not confinemyself to any specific construction, and my invention is applicable totwisting fiat bars which may be considered as having two flanges.

- Having now described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. As a device for twisting flanged bars, a sectional twist die E madeup of parts 6 e e 6 equal to the number of flanges on the bar andeaehradapted to lie between adjacent flanges.

2. As a device for twisting flanged rods, a sectional twist die E madeup of parts e e e 6 equal to the number of flanges on the bar, and eachadapted 'to lie between adjacent flanges in combination with a boXCadapted to hold the die sections together while permitting their readyremoval with a twisted bar.

3. As a device for twisting flanged rods, a series of sectional twistdies E E, 850., each made up of parts 6 e e e equal in number to theflanges on the bar to be twisted, and each section adapted to liebetween adjacent flanges, in combination with a holder adapted to holdthe dies in position while permitting their removal with a twisted bar.

4. As a device for twisting flanged rods, a pair of grooved rolls A A incombination with a die holder 0 situated in front thereof, and a twistdie or dies E made up of sections e e e e equal to the number of flangeson the bar to be twisted, and each adapted to lie between adjoiningflanges, said sectional die or dies being held in the holder O,butadapted to be readily removed therefrom.

5. As a device for twisting flanged rods, a pair of grooved rolls A A incombination with a die holder 0 situated in front thereof, a.

guide B B leading from the rolls to the die holder, and a twist die ordies E made up of sections 6 c e 6 equal to the number of flanges on thebar to be twisted and each adapted to lie between adjoining flanges,said sectional die or dies being held in the holder 0, but adapted to bereadily removed therefrom.

GEO. H. SELLERS. Witnesses:

LISLE S'roKEs, FRANCIS T. CHAMBERS.

